package com.lucian.ge.filter;

import com.lucian.ge.comman.model.ResultMap;
import com.lucian.ge.shiro.JWTToken;
import org.apache.shiro.authz.UnauthorizedException;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;

/**
 * Created by Lucicol on 2019/4/29.
 */
public class JWTFilter extends BasicHttpAuthenticationFilter {
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) throws UnauthorizedException {
        if (isLoginAttempt(request, response)) {
            try {
                executeLogin(request, response);
                return true;
            } catch (Exception e) {
                responseError(response, e.getMessage());
            }
        }
        return true;
    }

    @Override
    protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
        HttpServletRequest req = (HttpServletRequest) request;
        String token = req.getHeader("Token");
        return token != null;
    }

    @Override
    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        String token = httpServletRequest.getHeader("Token");
        JWTToken jwtToken = new JWTToken(token);
        getSubject(request, response).login(jwtToken);
        return true;
    }

    /**
     * 对跨域提供支持
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }

//    private void responseError(ServletResponse response, String message) {
//        try {
//            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//            //设置编码，否则中文字符在重定向时会变为空字符串
//            message = URLEncoder.encode(message, "UTF-8");
//            httpServletResponse.sendRedirect("/geweb" + message);
//        } catch (IOException e) {
//            logger.error(e.getMessage());
//        }
//    }
    private void responseError(ServletResponse response, String message) {
//            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
            //设置编码，否则中文字符在重定向时会变为空字符串
//            httpServletResponse.message;
    }
}
